Nickel‐Catalyzed Allylmethylation of Alkynes with Allylic Alcohols and AlMe
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: Facile Access to Skipped Dienes and Trienes
作者:Wanfang Li、Shun Yu、Jincan Li、Yu Zhao
DOI:10.1002/anie.202006322
日期:2020.8.17
herein an unprecedented allylative dicarbofunctionalization of alkynes with allylic alcohols. This simple catalytic procedure utilizes commercially available Ni(COD)2, triphenylphosphine, and inexpensive reagents, and delivers valuable skipped dienes and trienes with an all‐carbontetrasubstitutedalkeneunit in a highly stereoselective fashion. Preliminary mechanistic studies support the reaction pathway
A revisit of organoaluminumreagents for cross-coupling reactions has opened up several types of C–C bond formation protocols through cleavage of phenolic/alcoholic C–O and C–F and ammonium C–N bonds. Catalyzed by the commercially available NiCl2(PCy3)2 catalyst, these reactions proceed smoothly with a wide range of substrates and broad functional group compatibility, providing a versatile methodology
作者:Dominic R. Willcox、Daniel M. De Rosa、Jack Howley、Abigail Levy、Alan Steven、Gary S. Nichol、Carole A. Morrison、Michael J. Cowley、Stephen P. Thomas
DOI:10.1002/anie.202106216
日期:2021.9.13
reactivity at the aluminium hydride centre, switching off hydroalumination and instead enabling selective reactions at the alkyne C−H σ-bond. Chemoselective C−H borylation was observed across a series of aryl- and alkyl-substituted alkynes (21 examples). On the basis of kinetic and density functional theory studies, a mechanism in which C−H borylation proceeds by σ-bondmetathesis between pinacolborane (HBpin)
Regioselective Copper-Catalyzed Alkylation of [2.2.2]-Acylnitroso Cycloadducts: Remarkable Effect of the Halide of Grignard Reagents
作者:Stefano Crotti、Ferruccio Bertolini、Valeria di Bussolo、Mauro Pineschi
DOI:10.1021/ol100454c
日期:2010.4.16
organometallic reagents of [2.2.2]-acylnitroso cycloadducts, including an enantioselective kinetic resolution of these compounds, has been accomplished for the first time. By the careful choice of reaction conditions, it was possible to obtain new cyclohexenyl hydroxamic acids with complete anti-stereoselectivity and a nice regioalternating control. A remarkable effect of the halogen of the Grignard reagent
Enantioselective Synthesis of Quaternary Carbon Stereogenic Centers through Copper-Catalyzed Conjugate Additions of Aryl- and Alkylaluminum Reagents to Acyclic Trisubstituted Enones
作者:Jennifer A. Dabrowski、Matthew T. Villaume、Amir H. Hoveyda
DOI:10.1002/anie.201304035
日期:2013.7.29
Acyclicquaternarycarbons by conjugateaddition: The first examples of catalytic enantioselectiveconjugateadditions of aryl and alkyl units that generate acyclic all‐carbonquaternarystereogeniccenters have been developed (see scheme). The requisite organoaluminum reagents can either be prepared in situ from easily available organolithiums or purchased at low cost.